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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb246d39bcc9fd7356586bfed1cf1ad43fe1833a1267e593a8a0a0099d2956b' 
  AND token = '9RHCDF+7bP9shWcJfl7jLBNJGvSj6x8BmBo4Qye8JfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}